Interested to Buy Any Domain ? << Click Here >> for more details...
There is a 50m long army platoon marching ahead. The last
person in the platoon wants to give a letter to the first
person leading the platoon. So while the platoon is
marching he runs ahead, reaches the first person and hands
over the letter to him and without stopping he runs and
comes back to his original position.
In the mean time the whole platoon has moved ahead by 50m.
The question is how much distance did the last person cover
in that time. Assuming that he ran the whole distance with
uniform speed.
- 4 Answers
- 24777 Views
- Infosys, I also Faced
- E-Mail Answers
Answer Posted / guest
The last person covered 120.71 meters.
It is given that the platoon and the last person moved with
uniform speed. Also, they both moved for the identical
amount of time. Hence, the ratio of the distance they
covered - while person moving forward and backword - are
equal.
Let's assume that when the last person reached the first
person, the platoon moved X meters forward.
Thus, while moving forward the last person moved (50+X)
meters whereas the platoon moved X meters.
Similarly, while moving back the last person moved [50-(50-
X)] X meters whereas the platoon moved (50-X) meters.
Now, as the ratios are equal,
(50+X)/X = X/(50-X)
(50+X)*(50-X) = X*X
Solving, X=35.355 meters
Thus, total distance covered by the last person
= (50+X) + X
= 2*X + 50
= 2*(35.355) + 50
= 120.71 meters
Note that at first glance, one might think that the total
distance covered by the last person is 100 meters, as he
ran the total lenght of the platoon (50 meters) twice.
TRUE, but that's the relative distance covered by the last
person i.e. assuming that the platoon is stationary.
| Is This Answer Correct ? | 75 Yes | 15 No |
Post New Answer View All Answers
if the word 'ddosszm' is changed to 'central' then what will be the change for 'rtjbl' ?
the decimal number was given.it was converted to other system.they asked to identify the system.i.e. octal,hexadecimal.
Age of Grandfather is the ages of 4 grandchildren where their ages are in consecutive.Find the age of Grandfather.
In a cycle race there are 5 persons named as J, K, L, M, N participated for 5 positions so that in how many number of ways can M make always before N?
A boy asks the relation of two people walking along the street. One of them says that the lady walking with him is the daughter of his mother's only son. What is the relation between the two people?
in how many ways can a lock be opened if that lock has three digit number lock if the last digit is 9 and sum of the first two digits is less than or equal to the last digit. numbers are from 0-9
A boy multiplied a number with 10 and got 100,instead of dividing it . If he divided it what would be the answer?
How many 3 digits with 3 Distinct digits are there from 100-1000.
in a company 30% are supervisors and 40% employees are male if 60% of supervisors are male. what is the probability that a randomly choosen employee is a male or female?
X and Y are partners in a business. X invests 300 for 12 months and Y invested 600 for 6 months. If they gain a profit of 700 at the end of one year, what is X's share?
total balls are z, the number of red balls is n and the remaining are blak balls,then the % of black balls equal to ?
If P=Total number of components, Q = number of defective components .What is the % of non defective components?
tickets numbered 1 to 20 are mixed up and then a ticket is drawn at random. What is the probability that the ticket drawn has a number which is a multiple of 3 or 5?
In base 10 representation for a rupee 100 paise,then base 8 representation what is rupee value?
distance D=rt where r & t are +ve and r is constant,as t increases then D_________
